Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/6618#issuecomment-108611940
  
    See https://issues.apache.org/jira/browse/SPARK-8062 for the original 
stacktrace and investigation.
    
    This PR is opened against branch-1.2 because I'm trying to deliver a hotfix 
to a user running 1.2.1; I'm going to open another patch to fix this in 1.3.x, 
1.4.x, and master.
    
    While investigating this, I may have discovered other bugs in our input 
output metrics code, which I'll follow up on in subsequent patches; see 
https://issues.apache.org/jira/browse/SPARK-8086 for details.
    
    /cc @sryza


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